/Engine/Source/Runtime/MeshDescription/Public/MeshDescriptionBase.h
Get the vertex instances which define this triangle
void GetTriangleVertexInstances ( [FTriangleID](API\Runtime\MeshDescription\FTriangleID) TriangleID, [TArray](API\Runtime\Core\Containers\TArray)< [FVertexInstanceID](API\Runtime\MeshDescription\FVertexInstanceID) > & OutVertexInstanceIDs ) const